【最新】電大開放英語1形考冊作業(yè)14答案參考資料

1、開放英語(1)形考冊參考答案作業(yè)1第一部分 交際用語（每題2分，共10分）1.b2. b3. b4.a 5. c第二部分 詞匯與結構（每題2分，共40分）6. b7. a8.c 9.c 10. c 11. b12. b13.c14.c 15. c16.b17. a18.b19.b20. a21.b 22. a23.b24.a25. b第三部分閱讀理解（每題2分，共20分）26. b 27. c 28. b 29. a30. a31. c32. a33.b34. a 35.c第四部分翻譯（每題3分，共30分）以下答案供參考36. a quarter past seven (oclock ) /

2、seven fifteen37. from 8 (oclock ) in the morning to 3 (oclock ) in the afternoon / from 8 pm to 3 am38. works in insurance 39. thats a good idea40. why dont you41. 明天下午去踢足球怎么樣？42. 我想找一套一樓的公寓。43. 你喜歡看英文報紙嗎？44他不是程序員, 他是工程師。45她正在和客戶談話。作業(yè)2第一部分 交際用語（每題2分，共10分）1.c2. b3. b4.c 5. c第二部分 詞匯與結構（每題2分，共40分）6. b7

3、. c8.b 9.a 10. c 11. c12. a13.a14.a 15. a16.b17. a18.b19.a20. a21.a 22. c23.a24.b25. c第三部分閱讀理解（每題2分，共20分）26. b 27. a 28. c 29. a30. c31. c32. a33. a34. b 35. b第四部分翻譯（每題3分，共30分）以下答案供參考36. whats the weather like today37. not comfortable enough38. opposite the supermarket39. would you like to leave a m

4、essage40. is bad at / isnt good at41. 她不喜歡向別人借東西。42. 倫敦是個熱鬧、嘈雜、擁擠而又令人興奮的地方，但生活費用太高。43. 我和朋友們每周去兩次健身中心。我們在那里游泳或做其它運動。44他一頭短短的棕色卷發(fā)，藍色的眼睛，留著短胡須。45從機場到市中心坐出租車大約需要四十分鐘。作業(yè)3第一部分 交際用語（每題2分，共10分）1.a2. a3. c4.c 5. b第二部分 詞匯與結構（每題2分，共40分）6. b7. b 8.b 9.a 10. a 11. b12. a13.c14.b 15. a16. a17. c18.b19.a20. b21.

5、c 22. c23.b24.a25. b第三部分閱讀理解（每題2分，共20分）26. c 27. b 28. b 29. a30. b31. a32. c33. a34. b 35. c第四部分翻譯（每題3分，共30分）以下答案供參考36. are you free / will you be free37. what does he look like?38. ive got a cold. / ive caught a cold39. is bad at/ isnt good at40. how are you feeling today?41. 你在北京呆了多少天？42. 再下個月，我每

6、周練兩次體操。43. 他擅長于網(wǎng)頁設計，比她強很多。44我們冰箱里的奶酪多的是45我覺得很難受，頭疼，背痛，嗓子疼。作業(yè)4第一部分 交際用語（每題2分，共10分）1.b2. a3. b4.c 5. c第二部分 詞匯與結構（每題2分，共40分）6. b7. b 8.b 9.a 10. a 11. b12. a13.b14.b 15. c16. b17. b18.a19.c20. c21. b 22. b23.a24.b25. a第三部分閱讀理解（每題2分，共20分）26. b 27. c 28. a 29. b30. a31. a32. b33. b34. c 35. b第四部分翻譯（每題3分，

7、共30分）以下答案供參考36. call me before seven37. not as exciting as london38. who is responsible for39. im not feeling well40. do you prefer / do you like better41. 他個子不太高，帶著眼睛。42. 我不喜歡這套公寓。它離公路太近了。43. 明天下午去踢足球怎么樣？44銀行在拐角處。對面是報刊亭。45簡比瑪麗更擅長于網(wǎng)頁設計，但是瑪麗在培訓方面更富有經(jīng)驗。請您刪除一下內(nèi)容，o(_)o謝謝！2016年中央電大期末復習考試小抄大全，電大期末考試必備小抄，電

8、大考試必過小抄acetylcholine is a neurotransmitter released from nerve endings (terminals) in both the peripheral and the central nervous systems. it is synthesized within the nerve terminal from choline, taken up from the tissue fluid into the nerve ending by a specialized transport mechanism. the enzyme n

9、ecessary for this synthesis is formed in the nerve cell body and passes down the axon to its end, carried in the axoplasmic flow, the slow movement of intracellular substance (cytoplasm). acetylcholine is stored in the nerve terminal, sequestered in small vesicles awaiting release. when a nerve acti

10、on potential reaches and invades the nerve terminal, a shower of acetylcholine vesicles is released into the junction (synapse) between the nerve terminal and the effector cell which the nerve activates. this may be another nerve cell or a muscle or gland cell. thus electrical signals are converted

11、to chemical signals, allowing messages to be passed between nerve cells or between nerve cells and non-nerve cells. this process is termed chemical neurotransmission and was first demonstrated, for nerves to the heart, by the german pharmacologist loewi in 1921. chemical transmission involving acety

12、lcholine is known as cholinergic. acetylcholine acts as a transmitter between motor nerves and the fibres of skeletal muscle at all neuromuscular junctions. at this type of synapse, the nerve terminal is closely apposed to the cell membrane of a muscle fibre at the so-called motor end plate. on rele

13、ase, acetylcholine acts almost instantly, to cause a sequence of chemical and physical events (starting with depolarization of the motor endplate) which cause contraction of the muscle fibre. this is exactly what is required for voluntary muscles in which a rapid response to a command is required. t

14、he action of acetylcholine is terminated rapidly, in around 10 milliseconds; an enzyme (cholinesterase) breaks the transmitter down into choline and an acetate ion. the choline is then available for re-uptake into the nerve terminal. these same principles apply to cholinergic transmission at sites o

15、ther than neuromuscular junctions, although the structure of the synapses differs. in the autonomic nervous system these include nerve-to-nerve synapses at the relay stations (ganglia) in both the sympathetic and the parasympathetic divisions, and the endings of parasympathetic nerve fibres on non-v

16、oluntary (smooth) muscle, the heart, and glandular cells; in response to activation of this nerve supply, smooth muscle contracts (notably in the gut), the frequency of heart beat is slowed, and glands secrete. acetylcholine is also an important transmitter at many sites in the brain at nerve-to-ner

17、ve synapses. to understand how acetylcholine brings about a variety of effects in different cells it is necessary to understand membrane receptors. in post-synaptic membranes (those of the cells on which the nerve fibres terminate) there are many different sorts of receptors and some are receptors f

18、or acetylcholine. these are protein molecules that react specifically with acetylcholine in a reversible fashion. it is the complex of receptor combined with acetylcholine which brings about a biophysical reaction, resulting in the response from the receptive cell. two major types of acetylcholine r

19、eceptors exist in the membranes of cells. the type in skeletal muscle is known as nicotinic; in glands, smooth muscle, and the heart they are muscarinic; and there are some of each type in the brain. these terms are used because nicotine mimics the action of acetylcholine at nicotinic receptors, whe

20、reas muscarine, an alkaloid from the mushroom amanita muscaria, mimics the action of acetylcholine at the muscarinic receptors. acetylcholine is the neurotransmitter produced by neurons referred to as cholinergic neurons. in the peripheral nervous system acetylcholine plays a role in skeletal muscle

21、 movement, as well as in the regulation of smooth muscle and cardiac muscle. in the central nervous system acetylcholine is believed to be involved in learning, memory, and mood. acetylcholine is synthesized from choline and acetyl coenzyme a through the action of the enzyme choline acetyltransferas

22、e and becomes packaged into membrane-boundvesicles. after the arrival of a nerve signal at the termination of an axon, the vesicles fuse with the cell membrane, causing the release of acetylcholine into thesynaptic cleft. for the nerve signal to continue, acetylcholine must diffuse to another nearby

23、 neuron or muscle cell, where it will bind and activate areceptorprotein. there are two main types of cholinergic receptors, nicotinic and muscarinic. nicotinic receptors are located at synapses between two neurons and at synapses between neurons and skeletal muscle cells. upon activation a nicotini

24、c receptor acts as a channel for the movement of ions into and out of the neuron, directly resulting indepolarizationof the neuron. muscarinic receptors, located at the synapses of nerves with smooth or cardiac muscle, trigger a chain of chemical events referred to as signal transduction. for a chol

25、inergic neuron to receive another impulse, acetylcholine must be released from the receptor to which it has bound. this will only happen if the concentration of acetylcholine in the synaptic cleft is very low. low synaptic concentrations of acetylcholine can be maintained via a hydrolysis reaction c

26、atalyzed by the enzyme acetylcholinesterase. this enzyme hydrolyzes acetylcholine into acetic acid and choline. if acetylcholinesterase activity is inhibited, the synaptic concentration of acetylcholine will remain higher than normal. if this inhibition is irreversible, as in the case of exposure to

27、 many nerve gases and some pesticides, sweating, bronchial constriction, convulsions, paralysis, and possibly death can occur. although irreversible inhibition is dangerous, beneficial effects may be derived from transient (reversible) inhibition. drugs that inhibit acetylcholinesterase in a reversi

28、ble manner have been shown to improve memory in some people with alzheimers disease. abstract expressionism, movement of abstract painting that emerged in new york city during the mid-1940s and attained singular prominence in american art in the following decade; also called action painting and the

29、new york school. it was the first important school in american painting to declare its independence from european styles and to influence the development of art abroad. arshile gorky first gave impetus to the movement. his paintings, derived at first from the art of picasso, mir, and surrealism, bec

30、ame more personally expressive. jackson pollocks turbulent yet elegant abstract paintings, which were created by spattering paint on huge canvases placed on the floor, brought abstract expressionism before a hostile public. willem de koonings first one-man show in 1948 established him as a highly in

31、fluential artist. his intensely complicated abstract paintings of the 1940s were followed by images of woman, grotesque versions of buxom womanhood, which were virtually unparalleled in the sustained savagery of their execution. painters such as philip guston and franz kline turned to the abstract l

32、ate in the 1940s and soon developed strikingly original stylesthe former, lyrical and evocative, the latter, forceful and boldly dramatic. other important artists involved with the movement included hans hofmann, robert motherwell, and mark rothko; among other major abstract expressionists were such

33、 painters as clyfford still, theodoros stamos, adolph gottlieb, helen frankenthaler, lee krasner, and esteban vicente. abstract expressionism presented a broad range of stylistic diversity within its largely, though not exclusively, nonrepresentational framework. for example, the expressive violence

34、 and activity in paintings by de kooning or pollock marked the opposite end of the pole from the simple, quiescent images of mark rothko. basic to most abstract expressionist painting were the attention paid to surface qualities, i.e., qualities of brushstroke and texture; the use of huge canvases;

35、the adoption of an approach to space in which all parts of the canvas played an equally vital role in the total work; the harnessing of accidents that occurred during the process of painting; the glorification of the act of painting itself as a means of visual communication; and the attempt to trans

36、fer pure emotion directly onto the canvas. the movement had an inestimable influence on the many varieties of work that followed it, especially in the way its proponents used color and materials. its essential energy transmitted an enduring excitement to the american art scene. science and technolog

37、y is quite a broad category, and it covers everything from studying the stars and the planets to studying molecules and viruses. beginning with the greeks and hipparchus, continuing through ptolemy, copernicus and galileo, and today with our work on the international space station, man continues to

38、learn more and more about the heavens. from here, we look inward to biochemistry and biology. to truly understand biochemistry, scientists study and see the unseen bystudying the chemistry of biological processes. this science, along with biophysics, aims to bring a better understanding of how bodie

39、s work from how we turn food into energy to how nerve impulses transmit.analytic geometry, branch ofgeometryin which points are represented with respect to a coordinate system, such ascartesian coordinates, and in which the approach to geometric problems is primarily algebraic. its most common appli

40、cation is in the representation of equations involving two or three variables as curves in two or three dimensions or surfaces in three dimensions. for example, the linear equationax+by+c=0 represents a straight line in thexy-plane, and the linear equationax+by+cz+d=0 represents a plane in space, wh

41、erea, b, c,anddare constant numbers (coefficients). in this way a geometric problem can be translated into an algebraic problem and the methods of algebra brought to bear on its solution. conversely, the solution of a problem in algebra, such as finding the roots of an equation or system of equation

42、s, can be estimated or sometimes given exactly by geometric means, e.g., plotting curves and surfaces and determining points of intersection. in plane analytic geometry a line is frequently described in terms of its slope, which expresses its inclination to the coordinate axes; technically, the slop

43、emof a straight line is the (trigonometric) tangent of the angle it makes with thex-axis. if the line is parallel to thex-axis, its slope is zero. two or more lines with equal slopes are parallel to one another. in general, the slope of the line through the points (x1,y1) and (x2,y2) is given bym= (

44、y2-y1) / (x2-x1). the conic sections are treated in analytic geometry as the curves corresponding to the general quadratic equationax2+bxy+cy2+dx+ey+f=0, wherea, b, fare constants anda, b,andcare not all zero. in solid analytic geometry the orientation of a straight line is given not by one slope bu

45、t by its direction cosines, , , and , the cosines of the angles the line makes with thex-, y-,andz-axes, respectively; these satisfy the relationship 2+2+2= 1. in the same way that the conic sections are studied in two dimensions, the 17 quadric surfaces, e.g., the ellipsoid, paraboloid, and ellipti

46、c paraboloid, are studied in solid analytic geometry in terms of the general equationax2+by2+cz2+dxy+exz+fyz+px+qy+rz+s=0. the methods of analytic geometry have been generalized to four or more dimensions and have been combined with other branches of geometry. analytic geometry was introduced by ren

47、descartesin 1637 and was of fundamental importance in the development of thecalculusby sir isaac newton and g. w. leibniz in the late 17th cent. more recently it has served as the basis for the modern development and exploitation ofalgebraic geometry. circle, closed plane curve consisting of all poi

48、nts at a given distance from some fixed point, called the center. a circle is a conic section cut by a plane perpendicular to the axis of the cone. the term circle is also used to refer to the region enclosed by the curve, more properly called a circular region. the radius of a circle is any line segment con